Here is a fairly straight forward one and a half minute instructional video showing the basics of installing a SATA drive into your computer and attaching it to your motherboard:



http://www.buildeasypc.com/hw/howto/...hard_drive.htm

http://www.buildeasypc.com/

The only thing I would add is that in the video above ... take note of those blue SATA inputs → here that these inputs will have a priority/order which will be noted in the BIOS. You usually access the BIOS/SETUP via F2 or F11 by holding done the function key for a couple of seconds whilst powering up your PC. If Replacing C drive ... you want to plug your SATA into priority 0 or 1 depending on your motherboards listing. If you already have more than one SATA hooked up ... just look for the priority 0 connector ... pull that out and then reboot. If your pc cant start ... it's a safe bet you just unplugged you Primary C drive and now know which SATA port to plug yours into.

If any of that makes sense with the instructions above ... then you wont need your son.
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Hows that sound to you? You can just add an internal drive by adding an extra one if you have spare SATA ports just by plugging a new one into said spare port. ( a lot cheaper and faster running an internal one and you can get much more space as well compared to an external - BUT an external may do just as well if all this is too much to take in without your son) In most cases you wont have to do anything ... unless windows has an issue with recognizing the size of new drive. In that case you restart ... hit the appropriate function key to go into setup - Google SATA configuration ... and yadda yadda.

ANYHOOOOW it may depend on the age of your computers motherboard as to exactly what keys you hit to enter into BIOS mode as to the layout and choices you get in there.
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I'm going back to researching monitors for a whiles.